<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>1_非受控组件</title>
  </head>
  <body>
    <!-- 准备号一个容器 -->
    <div id="test"></div>

    <!-- 引入react核心库 -->
    <script type="text/javascript" src="../js/react.development.js"></script>
    <!-- 引入react-dom，用于支持react dom操作 -->
    <script type="text/javascript" src="../js/react-dom.development.js"></script>
    <!-- 引入babel，用于将jsx转为js -->
    <script type="text/javascript" src="../js/babel.min.js"></script>
    <script type="text/babel">
      // 1. 创建类组件
      class Login extends React.Component {
        handleSubmit = event => {
          event.preventDefault()
          const { username, password } = this
          alert(`用户名:${username.value},密码:${password.value}`)
        }

        render() {
          return (
            <form onSubmit={this.handleSubmit}>
              用户名：
              <input
                ref={e => {
                  this.username = e
                }}
                type="text"
                name="username"
              />
              密码：
              <input
                ref={e => {
                  this.password = e
                }}
                type="password"
                name="password"
              />
              <button>登录</button>
            </form>
          )
        }
      }

      // 2. 渲染组件到页面
      ReactDOM.render(<Login />, document.getElementById('test'))
    </script>
  </body>
</html>
